It was a bit over the official limit, I must admot, but the maximum time of an hour is no good for bikes - you can't have a proper bike-ride in an hour or less.
There is no official time limit for exercise. I don't know where the one hour idea originated.
The government website says:
There is no limit on how long you can exercise for, but you should spend as short a time away from your home as possible. Stay local if you can and act responsibly at all times.You can also exercise more than once a day and drive to a place of exercise as long as the exercise/drive balance is in favour of the exercise. You can even stop for a picnic lunch, again as long as the picnic isn't the dominant activity.
The government has certainly given out mixed messages on this, leading to confusion and misunderstanding, but it has at least tried to recognise the value of exercise and that not everyone's circumstances are the same, so people have to make their own judgements and act reasonably. The important thing is to maintain social distancing and to avoid getting yourself into a scrape that might require others to come to your rescue.
There was a poll not long back that claimed about 40% of the public said they were OK with having a total exercise ban under lockdown. This turns out to be almost identical to the proportion of us who take no exercise at all. I wonder whether these are the same folk.
For many of us exercise out of doors is not just a luxury, it's absolutely essential to keep sane. So keep cycling and enjoying your trips without guilt. Nice pics!